SPIGOT-4946: Add VillagerCareerChangeEvent

By: i509VCB <null>

paper-api/src/main/java/org/bukkit/event/entity/VillagerCareerChangeEvent.java

@@ -0,0 +1,92 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Villager;
+import org.bukkit.entity.Villager.Profession;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+public class VillagerCareerChangeEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    private Profession profession;
+    private final ChangeReason reason;
+
+    public VillagerCareerChangeEvent(@NotNull Villager what, @NotNull Profession profession, @NotNull ChangeReason reason) {
+        super(what);
+        this.profession = profession;
+        this.reason = reason;
+    }
+
+    @NotNull
+    @Override
+    public Villager getEntity() {
+        return (Villager) super.getEntity();
+    }
+
+    /**
+     * Gets the future profession of the villager.
+     *
+     * @return The profession the villager will change to
+     */
+    @NotNull
+    public Profession getProfession() {
+        return profession;
+    }
+
+    /**
+     * Sets the profession the villager will become from this event.
+     *
+     * @param profession new profession
+     */
+    public void setProfession(@NotNull Profession profession) {
+        this.profession = profession;
+    }
+
+    /**
+     * Gets the reason for why the villager's career is changing.
+     *
+     * @return Reason for villager's profession changing
+     */
+    @NotNull
+    public ChangeReason getReason() {
+        return reason;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(@NotNull boolean cancel) {
+        cancelled = cancel;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+    /**
+     * Reasons for the villager's profession changing.
+     */
+    public enum ChangeReason {
+
+        /**
+         * Villager lost their job due to too little experience.
+         */
+        LOSING_JOB,
+        /**
+         * Villager gained employment.
+         */
+        EMPLOYED;
+    }
+}